ResultSet: fix title filter clause when no filters are passed

cc @alex @ivan

This causes kicker favorites to be empty.

            SELECT
                from_table.targettedResource as resource
              , SUM(rsc.cachedScore)         as score
              , MIN(rsc.firstUpdate)         as firstUpdate
              , MAX(rsc.lastUpdate)          as lastUpdate
              , from_table.usedActivity      as activity
              , from_table.initiatingAgent   as agent
              , COALESCE(ri.title, from_table.targettedResource) as title
              , ri.mimetype as mimetype
              , 2 as linkStatus

            FROM
                ResourceLink from_table
            LEFT JOIN
                ResourceScoreCache rsc
                ON  from_table.targettedResource = rsc.targettedResource
                AND from_table.usedActivity      = rsc.usedActivity
                AND from_table.initiatingAgent   = rsc.initiatingAgent
            LEFT JOIN
                ResourceInfo ri
                ON from_table.targettedResource = ri.targettedResource

            

            WHERE
                (agent = 'org.kde.plasma.favorites.applications' OR agent = 'org.kde.plasma.favorites.documents')
                AND (activity = 'ffffffff-ffff-4fff-bfff-ffffffffffff' OR activity = ':global')
                AND (1)
                AND (1)
                AND (1)
                AND (title LIKE '%' ESCAPE '\')

            GROUP BY resource, title

            ORDER BY linkStatus DESC, score DESC, resource ASC
             LIMIT 100

This MR causes AND (title LIKE '%' ESCAPE '\') clause when no title filters are passed to be replaced with AND (1).

I thought this shouldn't happen reading https://www.sqlite.org/lang_expr.html about % operator, but apparently this causes issues when it is the only character.

This was similarly done in urlFilterClause since 972f0b26